The blu6 is still max 4 amps across all six bays. I generally married my batteries on the Nitecore for two cells as usual bays one and three or two and four. And the same for my triple sets just rotating each charge between the third batt each charge(can't charge three any longer as two bays are out). On the Nitecore it seemed like it took forever for a charge on a set of batts. I know on the blu6 the charge will be .368 per channel I believe ? I am just trying to figure out if the luc4 would be the better buy or just get the blu6 for the extra two slots and deal with the charge time. As I said i found both chargers for the same price (two different online sites) .
The Nitecore 4 bays limit to like 350mA with 4 cells charging. It's pitiful.
I'd expect the blu6 to still allow 4x1 (it should be 666mA per with 6 if it does 4A across the bays) and if so, barring some bad news about quality (my V4 has been fine) I'd get the blu6 for the extra bays, even if slower, and use the higher rate with just four when I wanted a faster charge (I've only used the 2A rate on 26650s, not 18650s).
Plus the geeky BT monitoring as a bonus.
I just got a Black Friday deal on an Xtar 4 bay. It's limited to 2x1A or 4x0.5A, but I'll live with that because it also charges NiMH chemistry and that's what I wanted it for. Working well so far.